html{
	background: #c0c0c0;
}

.button a {
	background: url(tip_01.jpg) no-repeat;
	width: 300px;
	height: 60px;
	display: block;
	margin: 0 auto 0 auto;
	text-decoration: none;
	text-indent: -100px;
	overflow: hidden;
}

.button a:hover{
	background-position: 0 -59px;
}